78691056 has 40 divisors (see below), whose sum is σ = 205393104. Its totient is φ = 25958400.

The previous prime is 78691049. The next prime is 78691057. The reversal of 78691056 is 65019687.

It is a junction number, because it is equal to n+sod(n) for n = 78690999 and 78691017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78691057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3795 + ... + 13106.

Almost surely, 2^78691056 is an apocalyptic number.

It is an amenable number.

78691056 is an abundant number, since it is smaller than the sum of its proper divisors (126702048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78691056 is a wasteful number, since it uses less digits than its factorization.

78691056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17009 (or 17003 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 78691056 is about 8870.7979347971. The cubic root of 78691056 is about 428.5239746823.

The spelling of 78691056 in words is "seventy-eight million, six hundred ninety-one thousand, fifty-six".